Simon, 54, publicly criticised his panel after they gave Miss Dynamix the boot from the competition rather than 17-year-old Hannah Barrett.

It is a sign that the show boss is unhappy with how things are going on his UK show.

The series is failing to win the ratings war against BBC rival Strictly Come Dancing.

And it has been dogged by reports that producers have pre-recorded vocals to cover up dodgy live singing by the finalists.

GONE: Judges should have kept Miss Dynamix said Simon Cowell [PA]

ANGRY: Simon with girlfriend Lauren Silverman in LA [SPLASH]

Simon reportedly ordered the judges to “toughen up” at the weekend and be more critical of contestants to make the live show more interesting.

In a series of tweets he suggested he was not happy with the standard of the wannabes trying their luck this series. Talking about Sunday’s result he tweeted: “I would have kept Miss Dynamix. I don’t get that decision.”

He said he could see only three acts who were likely to “sell records”.

But he added: “A couple more if they dig deep can do the same.”

A show insider said: “Simon doesn’t like being second. He’s going to do everything he can to make the show better.”

DEFIANT: Nicole, seen hitting the town after Sunday night's show, defended her singer Hannah [MATRIX]